PA Double Thick Gallery Framing Mats let you turn your photos and artwork into dramatic and exciting home decor pieces that can be hung on your walls, displayed on an easel, or even decoratively framed. Extra thick single layer mat with bevel inside edges. 12"x 16"/8"x 12" White Core White- Sizes indicate exterior dimensions and photo or art size, with the inner edge overlapping some of the image. Actual interior measurements about 7.5"x 11.5". White surface with White core bevel. Acid free but for Non-Conservation Framing.